MINOR: add test to make sure ProcessorStateManager can handle State Stores with logging disabled

Adding the test so we know that the State Stores with logging disabled or without a topic don't throw any exceptions.

Author: Damian Guy <damian.guy@gmail.com>

Reviewers: Guozhang Wang <wangguoz@gmail.com>

Closes #1916 from dguy/state-store-logging-disabled

streams/src/test/java/org/apache/kafka/streams/processor/internals/ProcessorStateManagerTest.java

@@ -48,6 +48,7 @@ import java.util.Map;
 import java.util.Set;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertFalse;
@@ -461,4 +462,12 @@ public class ProcessorStateManagerTest {
         assertEquals(new Long(123L + 1L), checkpointedOffsets.get(new TopicPartition(persistentStoreTopicName, 1)));
     }
 
+    @Test
+    public void shouldRegisterStoreWithoutLoggingEnabledAndNotBackedByATopic() throws Exception {
+        MockStateStoreSupplier.MockStateStore mockStateStore = new MockStateStoreSupplier.MockStateStore(nonPersistentStoreName, false);
+        ProcessorStateManager stateMgr = new ProcessorStateManager(applicationId, new TaskId(0, 1), noPartitions, new MockRestoreConsumer(), false, stateDirectory, null, Collections.<StateStore, ProcessorNode>emptyMap());
+        stateMgr.register(mockStateStore, false, mockStateStore.stateRestoreCallback);
+        assertNotNull(stateMgr.getStore(nonPersistentStoreName));
+    }
+
 }